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问题 单项选择题 A1/A2型题

关于神经递质的叙述，不正确的是（）

A.是化学传递的物质基础

B.由突触前神经元合成

C.在突触小泡内贮存

D.其释放与Ca的转移有关

E.发挥完效应后都经酶解失活

答案

参考答案：E

问答题

“5.7”空难发生后，“黑匣子”的打捞工作始终是人们关注的焦点，为了尽快将它打捞出水，专家们在失事海域进行探测，测量船在海面向海底发射波速为1450 m/s的超声波，并测得超声波从发射到反射回海面经历的时间为0.2 s，则“黑匣子”所在的海域的深度约为多少？
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补全对话，情景问答
从方框中选择恰当的句子填入空白处。
A. How are you going to do that?
B. I'm not sure yet.
C. What are you going to be?
D. I'm going to be an actor.
E. Who is your favorite actor?
A: 1 _______ when you grow up
B: I'm going to be a professional soccer player.
A: 2 _______.
B: I'm going to practice playing soccer every day.
A: Where are you going to work?
B. 3 _______ Maybe, Beijing or Shanghai. How about you?
A: 4 _______, and I'm going to take acting lessons for my dream.
B: 5 _______.
A: I like Zhou Jielun best.
B: I wish your dream will come true.
A: Thank you very much!
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